Question

The first ionisation energies of the elements of the first transition series ($Ti$ to $Cu$):

• A. increases as the atomic number increases
• B. decreases as the atomic number increases
• C. do not show any change as the addition of electrons takes place in the inner $(n-1)d-$orbitals
• D. increases from $Ti$ to $Mn$ and then decreases from $Mn$ to $Cu$

Answer 1

Answer: (A)

increases as the atomic number increases

First ionisation energies of 3d-series (first transition series) increases with increase in atomic number due to:

(a) increase in nuclear charge.

(b) decrease in atomic size.